package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.filePath}")
    private String filePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        log.info(file.toString());
        //file是临时文件需要转存
        //用UUID随机生成文件名
        String fileName = UUID.randomUUID().toString();
        //获取原始文件名后缀  .xxx
        String originalFilename = file.getOriginalFilename();
        String suffixName = originalFilename.substring(originalFilename.lastIndexOf("."));
        //组合
        fileName = fileName + suffixName;

        //创建一个目录对象
        File dir = new File(filePath);
        //判断是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(filePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
     public void download(String name , HttpServletResponse response){
        try {
            //输入流  获取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(filePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
     }
}
